From: "Iñaki Baz Castillo" <ibc@...>
Date: 2011-12-02T05:21:26+09:00
Subject: GC.malloc_allocated_size and GC.malloc_allocations not available (#if CALC_EXACT_MALLOC_SIZE)

Hi, using Ruby 1.9.3 I cannot use methods GC.malloc_allocated_size and
GC.malloc_allocations, which theorically do exist:

  http://www.ruby-doc.org/core-1.9.3/GC.html#method-c-malloc_allocated_size

Inspecting the gc.c file I've found at the end:

#if CALC_EXACT_MALLOC_SIZE
    rb_define_singleton_method(rb_mGC, "malloc_allocated_size",
gc_malloc_allocated_size, 0);
    rb_define_singleton_method(rb_mGC, "malloc_allocations",
gc_malloc_allocations, 0);
#endif

So it seems that in my system CALC_EXACT_MALLOC_SIZE is not set since
gc.c file also contains:

#define CALC_EXACT_MALLOC_SIZE 0

Why is it unavailable?

-- 
Iñaki Baz Castillo
<ibc@aliax.net>